Which of the following statements about CAS characteristics are correct?

Which of the following statements about CAS characteristics are correct?
A . HA comprehensively considers load factors such as virtual machine CPU, memory, I/O throughput and the virtual machine’s affinity (Affinity) to the physical host, dynamically adjusts the division responsible for the business, and improves system availability.
B . DRS can automatically select an idle server when a server fails and restart the VM on the idle server.
C . DRX comprehensively considers load factors such as virtual machine CPU, memory, I/O throughput and virtual machine affinity (Affinity) to the physical host, dynamically adjusts the division responsible for the business, and improves system availability.
D . V2V supports the conversion of vmware , citrix , kvm and other format virtual machines into H3CCAS virtual machines

Answer: D